Fig. 2

Comparison of Kaplan–Meier survival curves of the femoral head between the two groups. Line A shows the non-collapse rate of the femoral head in group A (treated with intramedullary core decompression combined with endoscopic intracapsular decompression). Line B shows the non-collapse rate of the femoral head in group B (treated with intramedullary core decompression alone). There were differences between the two groups (P < 0.05)